// Workers AI · dad joke modeWhat did speech interference level say? "I'm interrupting
 | This article relies on a single source. (March 2026) |
Speech Interference Level (SIL) is an acoustical parameter calculated from sound pressure levels measured in octave bands. It is used to characterize a noise signal in the frequency range where the human ear has its highest sensitivity.[1]
The Speech Interference Level is calculated as the arithmetic mean of unweighted sound pressure levels in three or four octave bands in the 500 Hz - 4 kHz frequency range.[2]
| PSIL | Arithmetic mean of 500 Hz, 1 kHz, and 2 kHz octave bands |
| SIL3 | Arithmetic mean of 1 kHz, 2 kHz, and 4 kHz octave bands |
| SIL4 | Arithmetic mean of 500 Hz, 1 kHz, 2 kHz, and 4 kHz octave bands |
References
[edit]- ↑ Karl D. Kryter (2023). The Handbook of Hearing and the Effects of Noise: Physiology, Psychology, and Public Health. Leiden, Netherlands: Brill Publishers. ISBN 9789004653443.
- ↑ Criteria for Evaluating Room Noise (standard). Melville, New York: American National Standards Institute. 2008. ANSI S12.2-2008.
- ↑ Acoustics — Description, measurement and assessment of environmental noise — Part 1: Basic quantities and assessment procedures (standard). Geneva, Switzerland: International Organization for Standardization. 2016. ISO 1996-1:2016. Retrieved 21 March 2026.
External links
[edit]- Speech Interference Levels in Aircraft Interior Noise Measurement
- Sound Metrics: Speech Interference Level, Siemens Knowledge article (2019)